We bought a sat-nav, but we never use it nowadays. Personally I prefer a road atlas, which I have a good look at before we set off and memorise not only the routes but the general area. I have also used Google Street, for instance when I had to attend a meeting in an area of London with which I was unfamiliar. I know London well, but the venue was between two Tube stations. The Google street thing showed me the shops nearby, and even a nice little cafe where I could get a cup of tea while waiting for the offices to open.
My husband used to tease me with the sat-nav by choosing an Irish lady's voice for the instructions. I loved her accent and it always made me smile; we called her Mrs Murphy. But after being in the Girl Guides, and learning about maps and so on, I prefer to navigate myself, not rely on Mrs Murphy!